Laserfiche WebLink
<br />. <br /> <br />. <br /> <br />. <br /> <br />Q <br />~ <br />N <br />I>Aio <br /> <br />CHAPTER II <br /> <br />NEED FOR ACTION <br /> <br />Mean annual salinity <br />at Imperial Dam <br />(mg/L) . <br />1:.' 1981 <br /> <br />2010 <br /> <br />Without salinity <br />control measures <br />With salinity <br />control measures <br />!/ Historical mean. <br /> <br />810 <br /> <br />1,089 <br /> <br />810 <br /> <br />894 <br /> <br />It is unlikely all of the salinity control units will be fully <br /> <br />implemented. <br /> <br />In order to attain the adopted salinity standard, add i- <br /> <br />tional \,ontrol, augmentation, or management steps will be necessary. <br /> <br />Thus weather modification, vegetation management, watershed improve- <br /> <br />ments, additional desalting, and various nonstructural measures remain <br /> <br />to be considered and studied in detail. <br /> <br />Big Sandy River Basin Salinity <br /> <br />The Big Sandy River carries an estimated annual salt load of about <br /> <br />164,000 tons to the Green and Colorado Rivers. Some of the salt loading <br /> <br />occurs from tributaries upstream from Farson, but the primary sources <br /> <br />are springs and seeps along a 26-mile reach of the river between Little <br /> <br />Sandy Creek and Gasson Bridge. <br /> <br />From available data it is estimated that the total quantity of <br /> <br />spring and seep flows entering the Big Sandy River between the conflu- <br /> <br />ence with Little Sandy Creek and Gasson Bridge is about 27 cubic feet <br /> <br />per second (cfs) or 19,550 acre-feet per year, with an average con- <br /> <br />cent ration of abou~ 4,400 mg/L and a salt load of approximately 116,000 <br /> <br />tons per year. The source of salt loading is apparently a combination <br /> <br />27 <br />